2,2-Diaryl-4-(4-aryl-4-hydroxy-piperidino)-butyramides

ABSTRACT

Compounds of the class of 2,2-diaryl-4-(4&#39;&#39;-aryl-4&#39;&#39;hydroxypiperidino)butyramides wherein said aryl and said amide functions are variously defined groups, said butyramides having anti-diarrheal and analgesic activities; also included are novel intermediates used in the synthesis of said butyramides.

United States Patent 1 Janssen et al.

[451 May 20, 1975 [73] Assignee: Janssen Pharmaceutica N.V.,

Beerse, Belgium [22] Filed: Dec. 7, 1972 [21] Appl. No.: 379,155

Related US. Application Data [60] Division of Ser. No. 129,607, March 30, 1971, Pat. No. 3,714,159, which is a continuation-in-part of Ser.

No. 42,530, June 1, 1970, abandoned.

[52] U.S. Cl ..260/247.7 G; 260/293.67;

[51] Int. Cl ..-.C07d 87/32; C07d 27/04; C07d 29/ 12 [58] Field of Search ..260/247.7 G, 326.5 D,

[56] References Cited OTHER PUBLICATIONS Boyd et a1., Chem. Comm, 1971, pp. 346-7.

Primary Examiner-Lorraine A. Weinberger Assistant Examiner-Richard D. Kelly Attorney, Agent, or Firm-Salvatore R. Conte [57] ABSTRACT Compounds of the class of 2,2-diary1-4-(4-aryl-4'- hydroxypiperidino)butyramides wherein said aryl and said amide functions are variously defined groups, said butyramides having anti-diarrhea] and analgesic activities; also included are novel intermediates used in the synthesis of said butyramides.

20 Claims,'No Drawings I 2 2,2-DIARYL-4-(4-ARYL-4-HYDROXY- O\\c N=z R PIPERIDINO)-BUTYRAMIDES I t H O CROSS-REFERENCE TO RELATED APPLICATION and Ph-C -CH(CH )CH -O v A This application is a division ofour co-pending appli- 5 L :3

cation Ser. No. 129,607 filed Mar. 30, 1971 now U.S. Pat. No. 3,714,159, which in turn is a continuation-in- (Lb) part of our application Ser. No. 42,530, filed June 1,

1970 now abandoned wherein R is a member selected from the group consist- BACKGROUND OF THE INVENTION ing of hydrogen and y Th v rt t th f M f 2 2 14 Ar, is a member selected from the group consisting t t ou consistm intestinal propulsion and as analgesics. The prior art I2 is a mem er Se ee 6 mm 6 gr p g of phenyl and halophenyl, preferably fluorophenyl; discloses certam 15 Alk is a'member selected from the group consistphenylpiperidino)butyronitriles as anti-diarrheals (see ing of and US. Pat. No. 2,898,340 and US. Pat. No. 3,539,579) among which is the well-known commercial product, ing of 2 ,2-diphenyl-4-[ (4-carbethoxy-4- v I phenyl)piperidino]butyronitrile, generically known as R diphenoxylate. Other prior art compounds include, C] 4 g O among others, various 2,2-diphenyl-4- I g Y L! piperidinobutyramides but not with hydroxy and aryl -N=Z is a member selected from the group consistfunctions disubstituted in the 4-position of the piperi- 2 dino ring as is found in the subject compounds. Such other compounds will be found in the following refer- 3 ences: 4

1. Synthetic Analgesics, by Dr. P. Janssen, Part I,

esp. pages 33, 34 and 37-41, Pergamon Press, and -N(CH CH=Cl-l in which R and R represent 1960; lower alkyl, preferably methyl, R is a member selected 2. Cheney et al., J. Org. Chem., 17, 770 (1952); from the group consisting of lower alkyl and benzyl, 3. C.A., 33, 551 (1944); and R is lower alkyl; 4. Bockmuhl et al., J. L. Ann. Chemie, 561, 52; N=Z is a member selected from the group consist- 5. C.A., 50, 4235 (1956); ing of NI-I and N H(lower alkyl);

6. Ofner et al., J. Chem. 800., 1950, 2158; N= '2 is y and 7. Janssen et al., J A Ch m 5 77 4423 Ar is a member selected from the group consisting (1 78, 3862 1956); of phenyl and substituted phenyl;

8. Janssen et al., Arch. intern. Pharmacodyn., 103, Pr0vided that,when Said is z a)-,

82 (1955); 107, 194 (1956); then said N=Z is other than N(CI-I CH=CH 9. Janssen et al., J. Pharm. Pharmacol., 9, 381 40 The therapeutically active non-toxic acid addition (1957 salts of the foregoing compounds (I) are also embraced 10. Moffett et al., J. Am. Chem. Soc., 79, 4451 and within the scope of this invention.

4462 (1957). As used herein, lower'alkyl and lower alkoxy SUMMARY may be straight or branch chained and have from 1 to about 6 carbon atoms, such as, for example, methyl, An object of this invention is to providea new class ethyl, propyl, isopropyl, butyl, pentyl, hexyl and the of 2,2-diaryl-4-piperidinobutyramides, in particular, like alkyls, and, respectively, the corresponding alkthose 2,2-diphenyl-(and halo-substituted diphenyl)-4- oxys such as methoxy, ethoxy, propoxy, isopropoxy, piperidinobutyramides which have both hydroxy and aryl substituents in the 4-position of the piperidine ring. 5 weight less than 127, i.e., fluoro, iodo, bromo and Said butyramides may be used alone or in combination chloro. The term substituted phenyl" means a phenyl with other therapeutically active agents in controlling group having one or more substituents thereon, such as diarrhea and in analgesia. lower alkyl, lower alkoxy, halo and trifluoromethyl.

v When more than one substituent is present, they may DES RIPTION F RE C 0 THE PREFER D be the same or different. Typical substituted phenyls EMBODIMENTS include mono-, (11- and trlhalophenyl, trifluoro- The novel y -(4aryl-4- methylphenyl, halo-trifluoromethylphenyl, mono-, di-

hydroxypiperidino)-butyramides of this invention may and tri-lower alkyl phenyl, and mono-, diand tri-lower be structurally represented by the following form l alkoxyphenyl. The term butyramide is used, other o N=Z 0 c R Y I l H Y L on i- 11 A Ar -CHZCH2- '3 A: A1 A: 3 2 2 etc. The term halo refers to halogens of atomic than in the examples and claims hereafter wherein it relates to specific compounds, in the broad sense to denote both butyramides (i.e., when the alkylene group between the a-carbon and the piperidino nitrogen is The compounds of formula (I-a) are conventiently obtained by the condensation of an appropriate 4-halo- 2,2-diarylbutyramide of formula (X), said halo preferably being chloro, with the piperidinols of formula (II'):

CH Cl-I and valeramides (i.e., when said alkyl- 5 or N(lower alkyl) with Ar being as previously described.

The compounds of formulas (I), (I-a) and (I-b) in which R represents a methyl group can obviously occur in stereochemical arrangements in which said methyl group is in a position cis or trans to the 4-hydroxy group. The nomenclature for those compounds has been simplified throughout this application by assigning the a-form conventionally to the isomer which separates first from the reaction mixture, whereas the ,B-form is assigned to the other isomer.

The organic bases of formulas (I), (I-a) and (l-b) may be converted to the corresponding pharmaceutically acceptable acid addition salts by reaction with an appropriate inorganic acid, such as, for example, hydrochloric, hydrobromic, hydriodic, sulfuric and the like acids, or with an appropriate organic acid, such as, for example, acetic, propionic, glycolic, lactic, ox alic, malonic, tartaric, citric, sulfamic, ascorbic and the like acids. In turn, the salts of formula (1), (1-0) and (I-b) may be converted to the corresponding base form by conventional treatment with suitable alkali.

The compounds of formula (I) are conveniently pre-' pared by the condensation of an appropriate 3,3-diaryltetrahydro-2-furylideneammonium salt of formula (II), preferably the bromide salt, with an appropriate 4-aryl- 4-piperidinol of formula (III) which may be used in the form of its acid addition salt, such as, for example, a hydrohalide. The condensation reaction can be carried out in such organic solvents as the aromatic hydrocarbons, e.g., benzene, toluene, xylene and the like, lower alkanols and lower alkanones, preferably 4-methyl-2- pentanone. Since during the condensation an equivalent of acid (HX) is liberated, it is desirable to use an appropriate amount of a suitable base, e.g., an alkali metal carbonate, to combine with the acid-released. The presence of a catalytic amount of potassium iodide may be desirable. The reaction scheme may be illustrated as follows (wherein Ar Ar Ar -N=Z, Alk and R are as heretofore described):

l Ax- AIJ-CH CH -CI (111) a ye l R a CH Ar CH CH 44 X l 2 Z A In like manner, the compounds of formula (I) can be prepared by the condensation of an appropriate w-halo-2,2-diarylbutyramide of formula (X-a) with the piperidinols of formula (III):

Such formula (X-a) compounds are prepared by treating a quaternary salt of formula (II) with suitable alkali, for example, a base such as an alkali metal or alkaline earth metal hydroxide, and thereby convert the quaternary salt into the carbinol of formula (X-b), the hydroxy function of which is transformed into a chloro function, e.g., by treatment with a chlorinating agent such as thionyl chloride, to thereby yield' the desired compound of formula (X-a):

OYN=Z base (1) The compounds of formula (I-b) may be prepared by the condensation of an appropriate 3,3-diphenyltetrahydro-2-furylidene ammonium salt of formula (XI), preferably the iodide salt, with the piperidinols of formula (III):

Phv

(m) bale The formula (X) butyramides are readily obtained by treating an appropriate 2-imino-3,3-diaryltetrahydrofuran'of formula (Xll) with gaseous I-ICl in a suitable organic solvent, such as,for example, chloroform, diisopropylether, 4-methyl-2-pentanone and the like, at elevated temperatures, if desired, to enhance the rate of reaction.

pii-c-cmcu mi-r (N-lower alkyl or )HN not - (XII-e) 4 i The formula (XI) quaternary salts may be prepared according to the following reaction sequence. 3-Cyano- 3,3-diphenylisobutyric acid (XV) is reduced to its corresponding alcohol form (XVI). Such reduction may be accomplished by first transforming the acid (XV) into its corresponding acid chloride form (XV-a) using standard acid to acid chloride techniques, for example, by means of thionyl chloride or oxalyl chloride, and then treating the thus-obtained acid chloride with a suitable reducing agent, for example, sodium borohydride. Ring-closure of the alcohol (XVI) to yield the furanimine vof formula (XVII) is then accomplished by treatment with gaseous HCl in a suitable organic solvent, preferably in the cold. The thus-obtained furanimine (in the form of a BC] salt) is then converted to the corresponding quaternary salt of formula (XI) by first treating said furanimine (XVII) with an alkali metal amide, for example, sodium or lithium amide, and than treating the thus-obtained alkali metal salt of (XVll) with excess lower alkyl iodide.

N Ph-C -CH(CH )-COOH The starting immonium-ethers of formula (II), wherein Alk-- is -Cl-I Cl-l are conveniently prepared by the condensation of an appropriate acyl halide, preferably the chloride, of formula (Vll) with an amine of the formula: l-I-N=Z, wherein Ar Ar and -N=Z are as previously defined. The condensation reaction can be carried out in such organic solvents as an aromatic hydrocarbon, chloroform and the like, to which may be added water and an appropriate amount of a suitable base, e.g., an alkali metal carbonate, to combine with the acid released.

3,884,916 7 8 The formula (II) immonium-ethers wherein Alk-- The compounds of formula (I), (La) and (1-1;), in is CH CH(CH may be obtained by the condenbase or salt form, are highly active inhibitors of gastro sation of an appropriate amide of formula (VIII) with intestinal propulsion and defecation and are therefore ally] bromide in the presence of a strong base Such as useful in the treatment of diarrhea. The anti-diarrhea] sodium amide in an aromatic hydrocarbon solvent and 5 activity of such compounds has been observed in exthen adding hydrogen bromide to the thus-obtained unperimental animals, for example, in rats according to saturated amide of formula (IX) to yield the correthe following test procedure. Young female Wistar rats sponding formula (II) immonium-ether. (230-250 g. body weight) are fasted overnight and in o =z I Y o N=Z Ar L m v x) Ara Br- In view of the novelty of the 3,3-diaryl-tetrahydro-2- the morning each animal is treated orally with a dose furyliden amm n um quat rn ry sa s f rmu (I level of the compound to be tested. One hour thereaffl of formula and their i i y as Precursors ter, the animal receives 1 ml. of castor oil orally. Each synthesizing the subject compounds, such quaternary animal is kept in an individual cage. At different time salts comprise an additional feature of this invention. intervals (1, 2, 3, 4, 6 and 8 hrs.) after the castor oil Most of the 4-aryl-4-hydroxypiperidine f f rmul treatment, the presence or absence of diarrhea is are known in the literature p See U noted. In more than 95% of 500 control animals, severe P 111 general, they y be P p diarrhea is observed 1 hour after treatment with castor by the condensation of an appropriate l-(lower alkoxyoil. Using this all-or-none criterium, a significant posi- )carbonyl-3-R-4-piperidone (IV), preferably wherein tive effect occurs with the tested compound if no diarthe lower alkoxy function is methoxy or ethoxy, with an rhea is observed 1 hour after the castor oil treatment. appropriate phenyl-magnesium halide (V) under The ED -value, i.e., the dose level at which such effect Grignard conditions. The protecting group in the lis observed in of the animals, for the subject composition of the thus-obtained l-(lower alkoxy)carbonypounds generally ranges from about 0.01 to about 10 l-3R-4-Ar -4-hydroxypiperidine (V1) is then removed mjglkg. A minimum of 5 dose levels are used per drug, by heating the latter with a suitable alkali, e.g., potaseach dose level being given to 10 rats on ten different sium hydroxide, to give the desired starting compound days.

(ill). The foregoing condensation reaction may be il- 45 in addition to anti-diarrhea] activity, many of the subv lustrated by the following reaction scheme: 7 ject compounds also possess analgesic activity, as dem- (w) i i (v) OH OH (lower alkoxfl-OC-O i H Ar A2 (v I I Alternatively, lbenzyl-3-R-4-piperidone may be onstrated in the rat tail withdrawal test described in condensed with (V) and the thus-obtained l-benzyl-3- Arzneimittel-Forschung, 13, 502 (l963). R-4-Ar -4-hydroxypiperidine is then debenzylated, for In the following tables, data relative to the antiexample, by hydrogenation over palladium-ondiarrhea] and analgesic activities of several compounds charcoal, to give the desired starting compound (III). are listed, it being understood that the compounds TABLE 4 C A:- -c -cu cu l l 2 Z A's Ar Ar -N=z A1 A n c Ph Ph 4mm 7 4-Cl-Ph 1. 00 40, 129

|| n Pb 0. l6 5 31 I u .m-r 4-Cl-Ph 5. oo 4o 8 TABLE 5 on Ph- -CH(CH3)CHZ-I -N=z M A s c 4mm) 4-C1-Ph o. 03 1.0 as 3-cr -4-c1-Ph c. 04 I 1.25 31 u 3-CF -Ph 0.01 1.25 125 TABLE 6 Known lntidiarrheal: I

dlphenoxyiate l5 6 4p ii i In view of their useful anti-diarrhea] and analgesic ac- 1-{2,2-bis(p-fluorophpnyl)-4-[4-hydroxy-4-(ptivities, the subject compounds and therapeutically usemethoxyphenyl)pipei'idinowaleryllpiperidine; iul acid addition salts thereof may be formulated in var- 4- {4-[4-(4-chloro-3-tr'- uoromethylpheny1).4. ious pharmaceutical forms for administration purposes, h d i idi ',2.bi

s. liquids, p injectables, tablets, capsules and 50 fluorophenynbutyryll-2,6-dimethylmorpholine; the like, according to conventional pharmaceutical 4-{4-[4-(p-ehlorophenyl)-4-hydroxypiperidino1-2.2-

techniques. diphenylvaleryllmorphloline;

The following compounds, in base forms, are repre- 1.{4.[4.h d .4-( qrhoxyphenyl)piperidino1- sentative of those embraced within the scope of this in- 2,2-diphenylvaleryl}pirleridine; vention and which may be prepared by the procedure 5 4-hydroxy-4-(p-chloropl1enyl)-a,a-diphenylpiperidiscussed herein: dine-l-butyramide; 4-(4-ethoxyphenyl)-N;N-diethyl-4-hydroxy-a,a- 4.h d .4.( th l-gnyl)-a,a-diphenylpiperidiphenylpiperidinel -butyramide; dine-1 -butyramide; .z- (pp y )-4-( y y- -p= 1- 4-[4-(p-chlorophenylji-4-hydroxypiperidino1-2- Y P P l y 'y l p i 6O (p-fluorophenyl)-2-phnylbutyryllpyrrolidine; l i4-[4-( 4-chloro 3-trifluoromethylphenyl)-4- N,N.di th l. -flugrg ihenyl)-4-hydroXy-flly yp p l-z.Z-b -(P- Ph nyD' phenyl-4-p-tolylpiperidgne-l-butyramide; y 'y p p i 4-(p=chlorophenyl)-a-(p-iiuorophenyl)-4-hydroxy .2- (pp y y y a-phenyl-N,N,y-trimethgilpiperidine-l-butyrarnide;

p y p p a y lpy z y 6s 4-(4-([4-(4-chloro-3-trifl ioromethylphenyl)-4- -(p- P y (pp y hydroxypiperidino]-2-(- wfluorophenyD-Z-phenyI- hydroxypiperidine-l-butyramide; butyfynmcfpholifle; N-benzyl-a,a-bis(p-chlorophenyl)-4-(3,4- .(2).}:,N-diallyl-a,a-bis p-fluorophenyl)-4- dichlorophenyl)-4-hydroxy-N-methyl=piperidinepmg. y i trifluoromethylphenyl iperidine- 1 -butyramide;

a-(i)-N-benzyl-4-hydroxy-N,3-dimethyl-4-(pmethylphenyl)a,a-diphenylpiperidine-1- butyramide; a-(:)-4-(p-chlorophenyl)-N,N-diethyl-a,a-bis(pfluorophenyl )-4-hydroxy-3-methylpiperidine- 1 butyramide; and f a'-(i)-4-[2,2-bis(p-fluorophenyl)-4-(4-hydroxy-3- methyl-4-phenyl)piperidinobutyryl]morpholine. Due to the asymmetric carbons present in the subject compounds, it is evident that their existence in the form 1 of stereochemical isomers (enantiomorphs) is'possible. If desired, the resolution and isolation or the production of a particular form can be accomplished by application of general principles and techniques known in the art. Such pharmacologically active enantiomorphs are naturally intended to be included within the scope of this invention.

The following examples are intended to illustrate and not to limit the scope of the present invention. Unless otherwise stated, all parts are by weight.

EXAMPLE I EXAMPLE III To a stirred and cooled solution of 30 parts of 4- bromo-2,Z-diphenylbutyrylchloride in 80 parts of toluene are added dropwise 16.5 parts of morpholine at 0C. Upon completion, stirring is continued overnight. The precipitated product is filtered off (filtrate is set aside) and suspended in water. The undissolved part is filtered off again, dried and recrystallized from 4-methyl-2-pentanone, yielding a first fraction of about 23.6 parts of 2-oxo-3,3-diphenyl-tetrahydrofuran are melted at 100C in an oil-bath and gaseous hydrogen bromide is introduced into it during 3 hours. Thereaction mixture is cooled and triturat'ed in benzene. The product is filtered off, washed with petroleumether and dried in an exsiccator, yielding 4-bromo-2,2- diphenylbutyric acid; m.p. 127.5C.

To a stirred suspension of 16 parts of 4-bromo-2,2-

I diphenylbutyric acid in 150 parts of chloroform are added dropwise 16 parts of thionyl chloride and the whole is stirred and refluxed for 2 hours. The reaction mixture is evaporated, yielding 4-bromo-2,2- diphenylbutyrylchloride as a residue.

15 parts of 4-bromo-2,2-diphenylbutyrylchloride are dissolved in 40 parts of benzene. This solution is added dropwise to a suspension of 7.1 parts of pyrrolidine in 40 parts of benzene while cooling (room temperature).

Upon completion, stirring is continued for 2 hours. The reaction mixture is evaporated. The residue isv taken up in water and the product is extracted with chloroform. The extract is dried and evaporated. The residue is crystallized from 4-methyl-2-pentanone, yielding 1- (tetrahydro-3,3-diphenyl-2-furylidene)pyrrolidinium bromide; m.p. 185.4-188.8C.

EXAMPLE II 9 parts of 4-(tetrahydro-3,3-diphenyl-2- furylidenehnorpholinium bromide; m.p. 174C. The organic phase of the mother-liquor (filtrate which was set aside) is washed with water, dried and evaporated.

The residue is crystallized from 4-methyl-2pent'anone, yielding a second fraction of about 2 parts of 4- (tetrahydro-3,3-diphenyl-2-furylidene)morpholinium bromide; m.p. 175.7l78.9C.

EXAMPLE IV 60 parts of 4-bromo-2,2-diphenylbutyrylchloride are dissolved in 400 parts of toluene and gaseous dimethylamine is introduced slowly into the solution while cooling (temperature is kept at about 0C). The introduction is ceased when dimethylamine escapes from the cooler, and stirring is continued for 2 hours at ordinary temperature. The precipitated product is filtered off and dissolved in a minimum quantity of water. The

.product is extracted with chloroform. The extract is dried and evaporated. The residue solidifies on triturating in 4-methyl-2-pentanone. The solid is filtered off and dried, yielding dimethyl (tetrahydro-3,3-diphenyl- 2-furylidene)ammonium bromide; m.p. l69-171.5C.

EXAMPLE V A suspension of 325 parts of 4-bromo-2,2- diphenylbutyrylchloride in 1440 parts of toluene is stirred in an ice-bath and while maintaining the temperature between 0C and 5C, there are added dropwise 146.3 parts of diethylamine dissolved in 160 parts of toluene. Upon completion, stirring is continued for 2 hours. The precipitated product is filtered off and dried. A sample of 20 parts is dissolved in water and extracted with chloroform. The extract is dried and evaporated. The oily residue is crystallized from diisopropylether. The solid product is filtered off and recrystallized from 4-methyl-2-pentanone, yielding diethyl (tetrahydro-3,3-diphenyl-2-furylidene) ammonium bromide; m.p. 171.8-177.8C.

EXAMPLE VI A mixture of 27 parts of N,N-dimethyl-2,2- diphenylacetamide, 9 parts of sodium amide 50% and parts of toluene is stirred and refluxed for 3 hours.

chloroform and a small qua After cooling, there are added 15 parts of allyl bromide and the whole is heated again to reflux temperature. After stirring at this temperature for 3 hours, the reaction mixture is cooled, washed with water, dried and evaporated. The oily residue solidifies on standing at room temperature for 2 days. The solid product is tritu rated in diisopropylether, filtered off again, and dried,

yielding N,N-dimethyl-2 ,2-diphenyl-4-pentenamide; m.p. 110.9C.

Twelve parts of N,N-dimethyl-Z,2-diphenyl-4- pentenamide are dissolved in 60 parts of glacial acetic EXAMPLE IX To a stirred and cooled mixture of 43.55 parts of 4- bromo-2,2-diphenylbutyrylchloride in 200 parts of toluene are added dropwise 33.3 parts of N,N-

. dibutylamine at a temperature between and C.

acid and gaseous hydrogen bromide is introduced into EXAMPLE VII Forty-five parts of sodium amide suspension 50% are suspended in 600 parts of toluene and at a temperature between 50 and 60C, there are added 132.5 parts of l-(2,Z-diphenylacetyl)pyrrolidine. The whole is stirred for 3 hours at 80C. The mixture is cooled to room temperature and there are added dropwise 75 parts of allyl bromide; Upon completion, the whole is heated to 80-90C and stirred at this temperature for 3 hours. The reaction mixture is cooled, washed with water, dr ed and evaporated. The residue is crystallized from diisopropylether, yielding l-(2,2 diphenyl-4-pentenoyl)pyrrolidine; m.p. 95.3C.

A solution of 55 parts of l-(2,2-diphenyI-4-pentenoyDpyrrolidine in 100 parts of glacial acetic acid iS stirred while gaseous hydrogen bromide is introduced into it till saturation (about 2 hours): temperature rises to about 60C. The reaction mixture is evaporated and the residue is crystallized from 4-methyl-2-pentanone, yield ng l-( tetrahydr0-5-methyl-3 ,3-diphenyl-2- furyl1dene)pyrrolidinium bromide; m.p. 226.2C.

EXAMPLE vrn olution of 42.9 parts of 4- hloride in 240 parts of to]- ature between 0 and 5C. is continued for one hour. tered off and there is added ntity of wate T vigorously stirred and the r he whole 15 rated, dried and evaporated The oil y residue 15 c t li126}? grom34gnciletgyl-2-pentanone, yielding diprop yl d era y ro- 1p enyl-2-furylidene a mide; m.p. 165.5167.6C. mmomum bro- 6.1 parts of dipropylamine Upon completion, stirring is continued for 1 hour. The reaction mixture is allowed to stand overnight and water is added. The toluene phase is separated, washed twice with water, dried and evaporated. The residue is taken up in diisopropylether and the solvent is evaporated again, yielding dibutyl (tetrahydro-3,3-diphenyl- 2-furylidene)ammonium bromide as an oil.

EXAMPLE X To a stirred mixture of 50.6 parts of 4-bromo-2,2- diphenylbutyrylchloride, 17.5 parts of triethylamine in 320 parts of toluene are added dropwise 17.3 parts of I 2,6-dimethylmorpholine (exothermic reaction; temperature rises to 50C). Upon completion, stirring is continued for 30 minutes at room temperature. The reaction mixture is filtered and the filtrate is washed successively with water, hydrochloric acid solution and water. The toluene phase is dried and evaporated. The oily residue is dissolved in diisopropylether and stirred overnight. The precipitated product is filtered off and dried, yielding 2,6-dimethyl-4-(tetrahydro-3,3-

- diphenyI-Z-furylidene)rnorpholinium bromide;

chloroform layer is sepam.p. 143.4-144.5c.

EXAMPLE XI 1 To a stirred and cooled mixture of 11 parts of 4- methylpiperidine, 10.6 parts of sodium carbonate and 150 parts of chloroform is added dropwise a solution of 33.8 parts of 4-bromo-2,Z-diphenylbutyrylchloride in 100 parts of water at a temperature between 0 and 5C. Upon completion, stirring is continued for 1.5 hrs. The layers are separated and the aqueous phase is extracted twice with chloroform. The combined organic layers are dried and evaporated. The residue is dissolved in warm 4-methyl-2-pentanone. After cooling while stirring, the product is crystallized. It is filtered off and dried in vacuo, yielding 4-methyl-1- (tctrahydro-3,3-diphenyl-2-furylidene)-piperidinium bromide; m.p. 192.7194.8C.

EXAMPLE XII To a stirred and cooled mixture of 14.7 parts of N- ethyl-N-methylamine hydrochloride, 23.3 parts of sodium carbonate, and 100 parts of water is added dropwise a solution of 33.8 parts of 4-bromo-2,2- diphenylbutyrylchloride in parts of toluene at a temperature between 0 and 5C. Upon completion, stirring is continued for 30 minutes. The layers are separated and the aqueous phase is extracted with chloroform. The combined organic layers are dried, filtered and evaporated. The residue is crystallized from acetone, yielding ethylmethyl (tetrahydro-3,3-diphenyl-2- furylidene) ammonium bromide; m.p. 172.1l73C.

EXAMPLE XIII To a stirred and cooled solution of 9.9 parts of 3- methylpiperidine, 10.6 parts of sodium carbonate in 100 parts of water is added dropwise a solution of 33.7 parts of 4-bromo-2,2-diphenylbutyrylchloride in 80 parts of toluene while keeping the temperature between and C. Upon completion, the ice-bath is removed and the whole is stirred for 1 hour at room temperature. The supernatant toluene phase is decanted and the oily layer together with the water-phase is extracted with chloroform. The extract is dried and evaporated. The oily residue solidifies on stirring in 200 parts of 4-methyl2-pentanone. The solid product is filtered off and dried, yielding 3-methyl-1-(tetrahydro- 3,3-diphenyl-2-furylidene)piperidinium bromide; m.p. 197.8-199C.

EXAMPLE XIV To a stirred and cooled lnixture of 43.55 parts of 4- bromo-2,Z-diphenylbutyrylchloride in 240 parts of toluene are added dropwise 31.3 parts of N-benzyl-N- methylamine at a temperature between 0 and 5C. Upon completion, the cooling-bath is removed and the mixture is allowed to stand overnight at room tempera ture. Water is added and the toluene phase is separated. The latter is washed twice with water, dried and evaporated. The residue is crystallized from diisopropylether and a small quantity of 4-methyl-2- pentanone. The solid product is filtered off, and dried, yielding benzylmethyl (tetrahydro-3,3-diphenyl-2- furylidene)ammonium bromide; m.p. 11 1.8-113.6C.

EXAMPLE XV To a stirred and cooled (ice-bath) solution of 43.5 parts of 4-bromo-2,2-diphenylbutyrylchloride in 200 parts of toluene are added dropwise 25.1 parts of N,N- diallylamine at a temperature between 0 and 5C. Upon completion, stirring is continued for 24 hours. The reaction mixture is filtered from some starting material and the filtrate is washed twice with water, dried and evaporated. The oily residue is dissolved in 320 parts of diisopropylether. The solution is stirred overnight while the solvent is evaporated without heating. The precipitated product is filtered off and dried, yielding diallyl (tetrahydro-3,3-diphenyl-2- furylidene)ammonium bromide; m.p. 97.5l00.lC.

EXAMPLE XVI To a stirred and cooled (ice-bath) mixture of 22 parts of N-methyl-N-propylamine hydrochloride, 3 l .8 parts of sodium carbonate and 200 parts of water is added dropwise a solution of 67.5 parts of 4-bromo-2,2- diphenylbutyryl chloride in I60 parts of toluene at 0C. Upon completion, stirring is continued for 1 hour at room temperature. The aqueous phase is separated and extracted with chloroform. The combined organic phases are dried and evaporated. The residue is dissolved in 4-methyl-2-pentanone. The solution is filtered and after cooling the filtrate to room temperature, the product is crystallized. It is filtered off and dried, yielding methylpropyl (tetrahydro-3,3-diphenyl-2- furylidene)ammonium bromide; m.p. 170,.2171.8C.

EXAMPLE XVII To a stirred and cooled (ice-bath) solution of 10.9 parts of N-isopropyl-N-methylamine hydrochloride, 21.2 parts of sodium carbonate and 100 parts of water is added dropwise a solution of 33.8 parts of 4-bromo- 2,2-diphenylbutyrylchloride in parts of toluene at 0C. Upon completion, stirring is continued for 1 hour. The aqueous phase is separated and extracted with chloroform. The combined organic layers are dried, filtered and evaporated, yielding methylisopropyl (tetrahydro-3,3-diphenyl-2-furylidene)ammonium bromide as a residue.

EXAMPLE XVIII A. A mixture of 11.16 parts of l-(tetrahydro-3,3- diphenyl-Z-furylidene)pyrrolidinium bromide, 6.33 parts of 4-(p-chlorophenyl)-4-piperidinol, 8 parts of sodium carbonate, 0.2 parts of potassium iodide and 240 parts of 4-methyl-2-pentanone is stirred and refluxed for 39 hours with water-separator. Then a second portion of 1 part l-(tetrahydro-3,3-diphenyl-2- furylidene)pyrrolidinium bromide is added and stirring at reflux temperature is continued for another 6 hours (water-separator). The reaction mixture is filtered hot and the filtrate is evaporated. The residue is dissolved in chloroform. The solution is washed with water, dried and evaporated. The residue is triturated in 4-methyl-2- pentanone. The precipitated product is filtered off, washed successively with 4-methyl-2-pentanone and petroleumether, and dried, yielding l- 4-[4-(pchlorophenyl)-4-hydroxypiperidino]-2,2-diphenylbutyryHpyrrolidine; m.p. 168.6C.

B. Utilizing the preparative method of Example XVIII-A, the following related compounds can be prepared, starting with an equivalent amount of the appropriate pyrrolidinium precursor of formula (H):

l- {4- [4-( p-chlorophenyl)-4-hydroxypiperidino -2 ,2-

bis(p-fluorophenyl)butyryl }pyrrolidine;

l- {4- 4-(p-chlorophenyl)-4-hydroxypiperidino -2 ,2-

bis(p-fluorophenyl)valeryll pyrrolidine; and l- {4-[4-(p-chlorophenyl)-4-hydroxypiperidino]-2- (p-fluorophenyl)-2-phenyl-butyryl }pyrrolidine.

EXAMPLE XIX piperidinol, 8 parts of sodium carbonate, 0.2 parts of potassium iodide and 240 parts of 4-methyl-2 pentanone is distilled azeotropically. Then there are 21 added 13.58 parts of 4-(tetrahydro-3,3-diphenyl-2- furylidene )morpholinium bromide and the whole is stirred and refluxed for 1.5 hours. The reactionmixture is filtered hot and the filtrate is evaporated. The residue is dissolved in toluene and diisopropylether. The solution is evaporated again. The residue is dissolved in acetone and acidified with an excess of 2-propano1 previously saturated with gaseous hydrogen chloride. Upon the addition of diisopropylether, the salt is crystallized.

It is filtered off, washed with acetone and dried, yield ing 4-{4-[4-(p-chlorophenyl)-4-hydroxypiperidino]- 2,2-diphenylbutyryl lmorpholine hydrochloride; m.p. 257.5C.

EXAMPLE XX A mixture of 6.33 parts of 4-(p-chlorophenyl)-4- piperidinol, 8 parts of sodium carbonate, 0.2 parts of potassium iodide and 240 parts of 4-methyl-2- pentanone is distilled azeotropically. Then there are added 12.12 parts of dimethyl (tetrahydro-3,3- diphenyl-2-fury1idene)ammonium bromide and the whole is stirred and refluxed for about hours. The reaction mixture is filtered hot and the filtrate is evaporated. The oily residue is dissolved in 2-propanol and to this solution is added an excess of 2-propanol previously saturated with gaseous hydrogen chloride. The whole is evaporated and the oily residue is warmed in diluted hydrochloric acid solution. Upon the addition of toluene, the salt is precipitated. It is filtered off, boiled in acetone, and filtered off again after cooling, yielding 4-(p-ch1oropheny1)-4-hydroxy-N,N-dimethyla,a-diphenylpiperidinel -butyramide hydrochloride; m.p. 222.1C.

EXAMPLE XXI A mixture of 6.33 parts of 4-(p-chlorophenyl)-4- piperidinol, 8 parts of sodium carbonate, 0.2 parts of potassium iodide in 240 parts of 4-methyl-2-pentanone is distilled azeotropically. Then there are added 13.45 parts of 1-(tetrahydro-3,3-clipheny1-2- furylidene)piperidinium bromide and the whole is stirred and refluxed with water-separator for 24 hours. The reaction mixture is filtered hot and the filtrate is evaporated. The residue is triturated in diisopropylether, filtered off again, washed with the same solvent and dried, yielding 12 parts of the crude base, 1-i4-[4-(p-chlorophenyl)-4-hydroxypiperidino]-2,2- diphenylbutyryl)piperidine, which is dissolved in chloreform. The solution is shaken with water, dried and evaporated. The residue is dissolved in acetone and diisopropylether is added. The crystallized product is filtered off and converted into its hydrochloride salt by treatment with excess 2-propanol previously saturated with hydrogen chloride. The crude salt is filtered off, dried for hours at 60C and after recrystallization from ethanol, pure l-{4-[4-(p-chloropheny1)-4- hydroxypiperidino]-2,2-diphenylbutyryllpiperidine hydrochloride is obtained; m.p. 251.1C.

EXAMPLE XXII A mixture of 13.5 parts of 1-(tetrahydro-3,3-diphenyI-Z-furylidene) piperidinium bromide, 5.75 parts of 4-p-tolyl-4-piperidinol, 8 parts of sodium carbonate, 0.2 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone is stirred and refluxed for 3 hours with water-separator. The reaction mixture is cooled and 200 parts of water is added. The organic l l l diphenylbutyry piperidine layer is separated, dried and evaporated. The oily residue is dissolved in parts of acetone and the solution is acidified with an excess of Z-propanol previously saturated with gaseous hydrogen chloride. The precipitated solid salt is filtered off and dried in vacuo, yielding about 13 parts of l-[4-(4-hydroxy-4-ptolylpiperidino)-2,2-diphenylbutyryl]piperidine hydrochloride hemihydrate; m.p. 240C.

EXAMPLE XXIII A mixture of 1 1.6 parts of l-(tetrahydro-3,3- diphenyl-Z-furylidene)-piperidinium bromide, 7 parts of 4-(4-chloro-3-trifluoromethylpheny1)-4-piperidino1, 8 parts of sodium carbonate, 0.2 parts of potassium iodide and 200 parts of 4-methyl-2pentanone is stirred and refluxed with water-separator for 3 hours. The reaction mixture is cooled and 200 parts of water is added. The organic layer is separated, dried and evaporated. The residue is dissolved in diisopropylether. The solution is filtered and the filtrate is acidified with an excess of 2-propanol previously saturated with gaseous hydrogen chloride, whereupon a sticky salt is precipitated. The solvent is decanted and the residue is stirred in 4-methyl-2-pentanone. Upon the addition of diisopropylether, an oily product is separated, which solidifies after stirring overnight. The solid is filtered off and dried, yielding about 10 parts of 1-{4-[4-(4-chloro-3- trifluoromethylphenyl-4-hydroxypiperidino]-2,2- diphenylbutyryl I piperidine hydrochloride; m.p. 204.4C.

EXAMPLE XXIV A. A mixture of 5.75 parts of dimethyl (tetrahydro- 3 ,3-diphenyl-2-fury1idene )ammonium bromide, 12.1 parts of 4-p-tolyl-4-piperidino1, 8 parts of sodium carbonate, 0.2 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone is stirred and refluxed with water-separator for 3 hours. The reaction mixture is cooled and 200 parts of water is added. The organic layer is separated, dried and evaporated. The oily free base is converted into its hydrochloride salt in the conventional manner, yielding 4-hydroxy-N,N-dimethyl-4- p-tolyl-a,a-diphenylpiperidine-1-butyramide hydrochloride; m.p. 206.6C.

B. The procedure of Example XXIV-A is followed, except that an equivalent amount of the appropriate immonium ether precursor of formula (11) is used, to yield the following compounds:

a,a-bis(p-fluorophenyl)-4-hydroxy-N,N-dimethyl-4- p-tolylpiperidine-l-butyramide hydrochloride; and a,a-bis(p-fluorophenyl)-4-hydroxy-N,N,y-trimethy1- 4-p-tolylpiperidine-1-butyrarnide hydrochloride.

EXAMPLE XXV A. A mixture of 11.6 parts of l-(tetrahydro-3,3- diphenyl-Z-furylidene)piperidinium bromide, 6.2 parts of 4-(3,4-dichlorophenyl)-4-piperidinol, 8 parts of sodium carbonate, 0.2 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone is stirred and refluxed for 3 hours with water-separator. The reaction is cooled and 200 parts of water is added. The organic layer is separated, dried and evaporated. The oily base residue is converted into its hydrochloride salt in the conventional manner, yielding l-(4-[4-(3,4- dichlorophenyl)-4-hydroxypiperidino]-2,2-

hydrochloride; m.p. 202.5C.

dide and 200 parts of 4-methyl-2-pentanone is stirred v and refluxed for 3 hours with water-separator. The reaction mixture is cooled and 200 parts of water is added. The organic layer is separated, dried and evaporated. The oily base residue is converted into the hydrochloride salt in the conventional manner, yielding about 1 1 parts of 4-( 4-[4-hydroxy-4-(3- trifluoromethyl-phenyl)piperidino]-2,2-diphenylbutyryllmorpholine hydrochloride; m.p. 213.6C.

B. Utilizing the preparative method of Example XXVI-A, the following related compounds can be prepared, starting with an equivalent amount of the appropriate morpholinium precursor of formula (11):

trifluoromethylphenyl)-piperidino]butyry1}morpholine hydrochloride;

' 4-{[2,2-bis(p-fluoropheny1]-4-[4-hydroxy-4-(3- trifluoromethylphenyl)-piperidino]va1eryl}morpholine hydrochloride;

(3-trifluoromethylpheny1)-piperidino]butyryll morpholine hydrochloride; and

' (3-trifluoromethylphenyl)-piperidino]va1eryl} morpholine hydrochloride.

EXAMPLE XXVII A. A mixture of 13.5 parts of 1-(tetrahydro-3,3- dipheny1-2-furylidene) piperidinium bromide, 7.4 parts of 4-(3-trifluoromethylpheny1)-4-piperidinol, 8 parts of sodium carbonate, 0.2 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone is stirred and refluxed for 3 hours with water separator. The reaction butyryllpiperidine hydrochloride; mp. 200C.

B. According to the procedure outlined in Example XXVII-A, except that equivalent quantities of the appropriate formula (II) and formula (III) starting materials are employed, there can be prepared:

1- i4-[ 4-( p-fluorophenyl )-4-hydroxypiperidino ]-2,2-

'diphenylvaleryll-piperidine hydrochloride; and

24 l {4-[4-hydroxy-4-p-methoxyphenyl)piperidino]-2,2-

diphenylvaleryl}-piperidine hydrochloride.

EXAMPLE XXVlll A mixture of 11.2 parts of diethyl (tetrahydro-3,3- dipheny1-2-furylidene) ammonium bromide, 7 parts of 4-(4-chloro-3-trifluoromethylphenyl)-4-piperidinol, 8 parts of sodium carbonate, 0.2 parts of potassium i0- dide and 200 parts of 4-methyl-2-pentanone is stirred and refluxed for 3 hours with water-separator. The reaction mixture is cooled and water is added. The organic layer is separated, washed with diluted sodium hydroxide solution, dried and concentrated to a volume of 150 parts. The concentrate is acidified with an excess of 2-propano1 previously saturated with gaseous hydrogen chloride. The'precipitated solid salt is filtered off and dried, yielding 4-(4-chloro-3- diphenylpiperidine-l--butyramide hydrochloride; m.p.

EXAMPLE XXIX A mixture of 13.5 parts of 1-(tetrahydro-3,3-diphenyl-2-furylidene) piperidinium bromide, 5.3 parts of 4-pheny1-4-piperidinol, 8 parts of sodium carbonate, 0.2 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone is stirred and refluxed for 3 hours with water-separator. The reaction mixture is cooled and 200 parts of water is added. The organic layer is separated, dried and evaporated. The solid residue is crystallized from 120 parts of 4-methyl-2- the crude free base of 1-[4-(4-hydroxy-4- phenylpiperidino)-2,2diphenylbutyryllpiperidine hydrochloride. It is dissolved in 4-methyl-2-pentanone and this solution is v acidified with an excess of 2-propanol previously saturated with gaseous hydrogen chloride. The precipitated salt is filtered off and dried, yielding 1-[4-(4-hydroxy- 4-phenylpiperidino)-2,2-diphenylbutyryllpiperidine hydrochloride; m.p. 240.3C.

EXAMPLE XXX A mixture of 13.6 parts of 4-(tetrahydro-3,3- diphenyl-Z-furylidene)-morpholinium bromide, 5.75 parts of 4-p-tolyl-4-piperidinol, 8 parts of sodium carbonate, 0 .2 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone is stirredand refluxed for 3 hours with water-separator. The reaction mixture is cooled and 200 parts of water is added. The organic layer is separated, dried and evaporated. The oily residue is dissolved in parts of 4-methyl-2-pentanone and the solution is acidified with an excess of 2- propanol previously saturated with gaseous hydrogen chloride. The precipitated solid salt is filtered off and dried in vacuo, yielding about 11.2 parts of 4-[4-(4- hydroxy-4-p-tolylpiperidino)-2',2-diphenylbutyry1]- morpholine hydrochloride; mp. 240C.

EXAMPLE XXX] A mixture of 9.7 parts of 4-(tetrahydro-3,3-dipheny1- 2-furylidene) morpholinium bromide, 7 parts of 4-(4- chloro3-trifluoromethy1phenyl)-4-piperidinol, 8 parts of sodium carbonate, 0.2 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone is stirred and refluxed for 3 hours with water-separator. The reaction mixture is cooled and water is added. The organic layer is separated, washed with diluted sodium hydroxide solution, dried and evaporated. The oily free base is converted into its hydrochloride salt and dried, yielding 4- {4-[4-(4-chloro-3-trifluoromethylphenyl)-4-hydroxy piperidino]-2,2-diphenylbutyryl morpholine hydrochloride; m.p. 243.1C.

EXAMPLE XXXll A mixture of 6.33 parts of 4-(p-chlorophenyl)-4- piperidinol, 8 parts of sodium carbonate, 0.2 parts of potassium iodide and 240 parts of 4-methyl-2- pentanone is dried azeotropically. After cooling to about 80C, there are added 14.5 parts of dimethyl (te-v trahydro-4-methyl-3 ,3 -diphenyl-2- furylidene)ammonium bromide and the whole is stirred overnight at reflux temperature. Then a second portion of 3 parts of dirnethyl (tetrahydro--rnethyl-3,3-diphenyl-2-furylidene) ammonium bromide is added and stirring at reflux is continued for another 4 hours. The reaction mixture is filtered hot and after cooling the filtrate to room temperature, the product is precipitated. It is filtered off, dried and crystallized from ethanol, yielding about 4.4 parts of 4-(p-chlorophenyl)-4- hydroxy-N ,Ny-trimethyl-a,a-diphenylpiperidine- 1 butyramide; m.p. 200.8C.

EXAMPLE XXXIII A. A mixture of 10.9 parts of 4-(tetrahydro-3,3- diphenyl-2-furylidene) morpholinium bromide, 6.2 parts of 4-(3,4-dichlorophenyl)-4-piperidinol, 8 parts of sodium carbonate, 0.2 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone is stirred and refluxed with water-separator for 5 hours. The reaction mixture is cooled and water (200 parts) is added. The organic layer is separated, dried and evaporated to a volume of about 200 parts. The concentrate is acidified with an excess of 2-propan0l previously saturated with gaseous hydrogen chloride". The crystallized salt is filtered off and dried, yielding 4-{4-[4-(3,4- dichlorophenyl)-4-hydroxypiperidino]-2,2-diphenylbutyryllmorpholine hydrochloride; m.p. 242.8C.

B. The process of Example XXXIII-A is repeated using equivalent quantities of the appropriate starting materials of formula (II) and formula (III) to prepare the following compounds:

trifluoromethylphenyl)piperidino]-2,2-diphenylvaleryl}morpholine hydrochloride; and 4-[4-(4-hydroxy-4-phenylpiperidino)-2,2-diphen valeryl]-morpholine hydrochloride.

EXAMPLE XXXIV A mixture of 13.1 parts of diethyl (tetrahydro-3,3- diphenyl-2-furylidene) ammonium bromide, 5.9 parts f 4-(p-fluorophenyl)-4-piperidinol, 8 parts of sodium carbonate, 0.2 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone is stirred and refluxed with water-separator for 5 hours. The reaction mixture is cooled and water (200 parts) is added. The organic layer is separated, washed with diluted sodium hydroxide solution, dried and filtered. The product is crystallized from the filtrate while stirring. It is filtered off and dried, yielding N,N-diethyl-4-(p-fluorophenyl)-4 hydroxy-a,a-diphenylpiperidinel -butyramide; m.p. 135.4C.

EXAMPLE XXXV A. A mixture of l 1.2 parts of diethyl (tetrahydro-3,3- diphenyI-Z-furylidene) ammonium bromide, 6.2 parts of 4-(3,4-dichlorophenyl)-4-piperidinol, 8 parts of sodium carbonate, 0.2 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone is stirred and refluxed for 3 hours with water-separator. The reaction mixture is cooled and water is added. The organic layeris separated, washed with diluted sodium hydroxide solution, dried and concentrated to a volume of about 150 parts. The concentrate is acidified by the addition of an excess of 2-propanol, previously saturated with gaseous hydrogen chloride. The salt is crystallized while stirring. It is filtered off, dried and recrystallized from 240 parts of 2-propanol, yielding 4-(3,4-dichlorophenyl)- N,N-diethyl-4-hydroxy-a,a-diphenylpiperidinel butyramide hydrochloride; m.p. 245.3C.

B. By repeating the procedure of Example XXXV-A, except that an equivalent quantity of diethyl (tetrahydro-5-methyl-3,3-diphenyl-2-furylidene) ammonium bromide is initially employed, the corresponding product, 4-(3,4-dichlorophenyl)-N,N-diethyl-4-hydroxy-ymethyl-a,a-diphenylpiperidine-1-butyramide hydrochloride is obtained.

EXAMPLE XXXVI diphenyl-Z-furylidene) ammonium bromide, 6.4 parts of 4-(p-chlorophenyl)-4-piperidinol, 8 parts of sodium carbonate, 0.2 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone is stirred and refluxed with water-separator for 3 hours. The reaction mixture is cooled and water is added. The organic layer is separated, dried and concentrated to a volume of about 175 parts. The turbid concentrate is filtered and the clear filtrate is acidified by the addition of an excess of 2- propanol previously saturated with gaseous hydrogen chloride. The crystallized salt is filtered off and dried in vacuo at C, yielding 4-(p-chlorophenyl)-N,N- diethyl-4-hydroxy-a,a-diphenylpiperidinel butyramide hydrochloride, hemi-isopropyl alcoholate; m.p. 236.6C.

EXAMPLE XXXVlI A mixture of 13 parts of 1-(tetrahydro-3,3-diphenylv2-furylidene) pyrrolidinium bromide, 5.3 parts of 4- phenyl-4-piperidinol, 8 parts of sodium carbonate, 0.2 parts of potassium iodide and 200 parts of 4-methyl-2- pentanone is stirred and refluxed for 5 hours with water-separator. The reaction mixture is cooled and water is added. The organic layer is separated, washed with diluted sodium hydroxide solution, dried, filtered and while stirring the filtrate, the product is crystallized. It is filtered off and dried, yielding l-[4-(4-hydroxy-4- phenylpiperidino )-2,Z-diphenylbutyryl]pyrrolidine; m.p. 187.5C.

EXAMPLE XXXVIII A mixture of 13 parts of l-(tetrahydro-3,3-dipheny1- 2-furylidene) pyrrolidinium bromide, 5.9 parts of 4-(pfluorophenyl)-4-piperidinol, 8 parts of sodium carbonate, 0.2 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone is stirred and refluxed for 5 hours with water-separator. The reaction mixture is cooled, and 200 parts of water is added. The organic layer is separated, washed with diluted sodium hydrox- 27 ide solution, dried, filtered and the product is crystallized from the filtrate. It is filtered off and dried, yielding about 9 parts of 1- 4-[4-(p-fluorophenyl)-4- hydroxypiperidino]-2,2-diphenylbutyryllpyrrolidine; m.p. 192.3C.

EXAMPLE XXXIX A mixture of 13.6 parts of 4.-(tetrahydro-3,3-diphe nyl-2-furylidene) morpholinium bromide, 5.3 parts of 4-phenyl-4-piperidinol, 8 parts of sodium carbonate, 0.2 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone is stirred and refluxed for 3 hours with water-separator. The reaction mixture is cooled and 200 parts of Water is added. The organic layer is separated, dried, filtered and evaporated. The oily residue is dissolved in 4-methyl-2-pentanone and the solution is acidified with an excess of 2-propano1 previously saturated with gaseous hydrogen chloride. Upon the addition of diisopropylether, the salt is crystallized. It is filtered off, dried and recrystallized from 80 parts of 2-propanol (activated charcoal), yielding about 8 parts of crude 4-[4-(4-hydroxy-4- phenylpiperidino)-2,Z-diphenylbutyryl]morpholine hydrochloride, hemi-isopropyl alcoholate. The latter fraction, together with the mother-liquors, is evaporated to dry and the oily residue is dissolved in water. The aqueous phase is alkalized with diluted sodium hydroxide solution and the free base is extracted with toluene. The extract is dried and evaporated. From the oily residue the hydrochloride salt is prepared, yielding 8 parts of pure 4-[4-hydroxy-4-phenylpiperidino)-2,2- diphenylbutyryl]-morpholine hydrochloride, hemiisopropyl alcoholate; m.p. 182.6C.

EXAMPLE XL A mixture of 13.1 parts of diethyl (tetrahydro-3,3- diphenyI-Z-furylidene) ammonium bromide, 5.3 parts of 4-phenyl-4-piperidinol, 8 parts of sodium carbonate, 0.2 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone, is stirred and refluxed for 3 hours with water-separator. The reaction mixture is cooled and 200 parts of water is added. The organic layer is separted, dried and concentrated to a volume of about 200 parts. The concentrate is filtered and then acidified with an excess of 2-propanol previously saturated with gaseous hydrogen chloride. The crystallized salt is filtered off, dried, to yield about 13 parts of crude N,N-diethyl-4-hydroxy-a,a,4-triphenylpiperidine- 1 butyramide hydrochloride, hemi-isopropyl alcoholate. The latter fraction, together with the residue of the evaporated filtrate, is dissolved in water. This aqueous solution is alkalized with sodium hydroxide solution and the free base is extracted with toluene. The extract is dried and evaporated. From the oily free base, the hydrochloride salt is prepared again as described in former examples, to yield about 11.5 parts of N,N- diethyl-4-hydroxy-a,a,4-triphenylpiperidine-1- butyramide hydrochloride, hemi-isopropyl alcoholate; m.p. 248.3C.

EXAMPLE XLI ter-separator. The reaction mixture is cooled and water 28 is added. The organic layer is separated, washed with diluted sodium hydroxide solution, dried, and filtered. While stirring the filtrate at room temperature, the

product is crystallized. It is filtered off and dried, yielding, after recrystallization from 80 parts of 4-methyl-2- pentanone (activated charcoal), about 5.5 parts of 1- [4-(4-hydroxy-4-p-tolylpiperidino)-2,2-diphenylbutyryl]pyrrolidine; m.p. 172.7C.

EXAMPLE XLll A mixture of 13.1 parts of diethyl (tetrahydro-3,3- dipheny1-2-furylidene) ammonium bromide, 7.4 parts of 4-(3-trifluoromethylphenyl)-4-piperidinol, 8 parts of sodium carbonate, 0.2 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone is stirred and refluxed for 3 hours with water-separator. The reaction mixture is cooled and water is added. The organic layer is separated, dried and concentrated to about 200 parts. The concentrate is filtered until clear and the filtrate is acidified with an excess of 2-propanol previously saturated with gaseous hydrogen chloride. The

whole is evaporated and the residue'is triturated in- 4-methyl-2-pentanone, yielding N,N-diethyl-4- hydroxy-a,a-diphenyl-4-( 3- trifluoromethylphenyl)piperidine-1 -butyramide hydrochloride; m.p. 222.2C.

EXAMPLE XLlll A mixture of 13 parts of 1-(tetrahydro-3,3-diphenyl- 2-furylidene)-pyrrolidinium bromide, 8.4 parts of 4( 4- chloro-3-trifluoromethylphenyl)-4-piperidinol, 8 parts of sodium carbonate, 0.5 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone is stirred and refluxed for 3 hours with water-separator. The reaction mixture is cooled and water is added. The organic layer is separated, washed with diluted sodium hydroxide solution, dried and evaporated. The residue is taken up in 2-propanol and acidified with an excess of 2- propanol previously saturated with gaseous hydrogen chloride. Upon stirring, the salt is crystallized, it is filtered off and recrystallized from 4-methy1-2-pentanone (activated charcoal), yielding l-{4-[4-(4-chlorO-3- trifluoromethylphenyl)-4-hydroxypiperidino]-2,2- diphenylbutyryl pyrrolidine hydrochloride; m.p. 188.1C.

EXAMPLE XLIV A mixture of 10.4 parts of dimethyl (tetrahydro-3,3- diphenyl-2-fury1idene)ammonium bromide, 6.2 parts of 4-(3,4-dichlorophenyl)-4-piperidinol, 8 parts of sodium carbonate, 0.5 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone is stirred and refluxed for 3 hours with water-separator. The reaction mixture is cooled and 200 parts of water is added. The organic layer is separated, washed with diluted sodium hydroxide solution, dried and evaporated to a volume of about 200 parts. The concentrate is acidified with an excess of 2-propanol previously saturated with gaseous hydrogen chloride. The salt crystallizes while stirring. It is filtered off and dried, yielding 4-(3,4-dichlorophenyl)-4- hydroxy-N ,N-dimethyl-a,a-diphenylpiperidine- 1 butyramide hydrochloride; m.p. 239.8C.

EXAMPLE XLV A mixture of 12.1 parts of dimethyl (tetrahydro-3,3- diphenyl-2-furylidene) ammonium bromide, 8.4 parts of 4-(4-chloro3-trifluoromethylphenyl)-4 piperidinol,

8 parts of sodium carbonate 0.4 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone is stirred and refluxed for 3 hours with water-separator.-The reaction mixture is cooled and water is added. The organic layer is separated, washed with diluted sodium hydroxide solution, dried and concentrated to a volume of about 200 parts. The concentrate is acidified with an excess of 2-propanol previously saturated with gaseous hydrogen chloride. Upon stirring, the salt is crystallized. It is filtered off and dried, yielding 4-(4-chloro-3- trifluoromethylphenyl)-4-hydroxy-N,N-dimethyl-a,adiphenylpiperidine-l-butyramide hydrochloride; m.p. 215.3C.

EXAMPLE XLVI A mixture of 21.3 parts of dimethyl (tetrahydro-S- methyl-3,3-diphenyl-2-furylidene) ammonium bromide, 5.9 parts of 4-(p-fluorophenyl)-4-piperidinol, 8 parts of sodium carbonate, 0.5 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone is stirred and refluxed for 32 hours with water-separator. The reaction mixture is cooled and 200 parts of water is added. The organic layer is separated, washed with diluted sodium hydroxide solution, dried and evaporated to a volume of about 150 parts. The concentrate is stirred at room temperature, whereupon the product is crystallized. It is filtered off and dried, yielding 4-(pfluorophenyl)-4-hydroxy-N,N,'y-trimethyl-a,adiphenylpiperidine-l-butyramide; m.p. 165.6C.

EXAMPLE XLVlI A mixture of 16.3 parts of dimethyl-(tetrahydro-S- methyl-3,3-diphenyl-2-furylidene) ammonium bromide, 5.3 parts of 4-phenyl-4-piperidinol, 8 parts of sodium carbonate, 0.5 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone is stirred and refluxed for 32 hours with water-separator. The reaction mixture is filtered hot and after cooling the filtrate to room temperature, the product is crystallized. It is filtered off and dried, yielding 4-hydroxy-N,N,y-trimethyl-a,a,4- triphenylpiperidine-l-butyramide; m.p. 193.1C.

EXAMPLE XLVIll A mixture of 12.1 parts of dimethyl (tetrahydro-3,3- diphenyl-Z-furylidene) ammonium bromide, 5.3 parts of 4-phenyl-4-piperidinol, 8 parts of sodium carbonate, 0.5 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone is stirred and refluxed for 3 hours with water-separator. The reaction mixture is cooled and 200 parts of water is added. The organic layer is separated, washed with diluted sodium hydroxide solution, dried, and concentrated to about 200 parts of its volume. The concentrate is acidified with an excess of 2-propanol previously saturated with gaseous hydrogen chloride. The precipitated acid salt is filtered off and the free base is liberated with alkali in the conventional manner. After crystallization from a mixture of diisopropylether and toluene, 4-hydroxy-N,N- dimethyl-a,a,4-triphenylpiperidine- 1 -butyramide is obtained; m.p. 130.3C

EXAMPLE XLlX A mixture of 12.1 parts of dimethyl (tetrahydro-3,3- diphenyl-Z-furylidene) ammonium bromide, 8.8 parts of 4-(p-bromophenyl)-4-piperidinol hydrochloride, 10.6 parts of sodium carbonate, 0.5 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone is stirred EXAMPLE L A mixture of 13.1 parts of diethyl (tetrahydro-3,3- diphenyl-2-furylidene) ammonium bromide, 8.8 parts of 4-(p-bromophenyl)-4-piperidinol hydrochloride, 10.6 parts of sodium carbonate, 0.5 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone is stirred and refluxed for 14 hours with water-separator. The reaction mixture is cooled and water is added. The organic layer is separated, washed with diluted sodium hydroxide solution, filtered and on stirring the filtrate, the product is crystallized. It is filtered off and recrystallized from parts of 4-methyl-2-pentanone (activated charcoal), yielding 4-(p-bromophenyl)-N,N- diethyl-4-hydroxy-oz,a-diphenylpiperidine-1 butyramide hemihydrate; m.p. 145.6C.

EXAMPLE LI A mixture of 11.1 parts of l-(tetrahydro-3,3-diphenyl-2-furylidene) pyrrolidinium bromide, 6.2 parts of 4-(3,4-dichlorophenyl)-4-piperidinol, 8 parts of sodium carbonate, 0.5 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone, is stirred and refluxed for 3 hours with water-separator. The reaction mixture is cooled and water is added. The organic layer is separated, washed with diluted sodium hydroxide solution, dried and concentrated to a volume of about 200 parts. The concentrate is acidified with an excess of 2- propanol previously saturated with gaseous hydrogen chloride. The crystallized product is filtered off and recrystallized from parts of boiling acetone, yielding 1- l4-[ 4-( 3 ,4-dichlorophenyl)-4-hydroxypiperidino 2,2-diphenylbutyryl pyrrolidine hydrochloride; m.p. 200.3C.

EXAMPLE Lll A mixture of 5.3 parts of 4-phenyl-4-piperidinol, 8 parts of sodium carbonate, 0.5 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone is stirred and refluxed and the amount of separated water is distilled off azeotropically. The mixture iscooled to about 40C, and there is added 12.8 parts of l-(tetrahydro-S- methyl-3;3diphenyl-2-furylidene)pyrrolidinium bromide. The whole is stirred and refluxed overnight. The second portion of 10 parts of l-(tetrahydro-5-methyl- 3,3-diphenyl-2-furylidene)pyrrolidinium bromide is added and stirring at reflux is continued for 12 hours. The reaction mixture is filtered hot and the filtrate is concentrated to a volume of about 180 parts. On stirring the concentrate, the product is crystallized. It is filtered off and dried, yielding 1-[4-(4-hydroxy-4- phenylpiperidino)-2,2-diphenylvaleryl]-pyrrolidine;

m.p. 168C.

EXAMPLE LlII A mixture of 12.1 parts of dimethyl (tetrahydro-3,3- diphenyl-Z-furylidene) ammonium bromide, 7.4 parts 31 of 4-(3-trifluoromethylphenyl)-4-piperidinol, 8 parts of sodium carbonate, 0.5 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone is stirred and refluxed for 4 hours with water-separator. The reaction mixture is cooled and water is added. The organic layer is separated, washed with diluted sodium hydroxide solution, dried and concentrated to a volume of about 200 parts. The concentrate is acidified with an excess of 2-propanol previously saturated with gaseous hydro- I gen chloride. Upon stirring, the salt is crystallized. It is filtered off and dried, yielding 4-hydroxy-N,N-

dimethyl-a,a-diphenyl-4-(3- trifluorornethylphenyl )piperidinel -butyramide hydrochloride; m.p. 185.7C.

EXAMPLE LIV A mixture of 13 parts of l-(tetrahydro-3,3-diphenyl- 2-furylidene)pyrrolidinium bromide, 7.4 parts of 4-(3- trifluoromethylphenyl)-4-piperidinol, 8 parts of sodium carbonate, 0.5 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone is stirred and refluxed for 5 hours with water-separator. The reaction mixture is cooled and water is added. The organic layer is separated, washed with diluted sodium hydroxide solution, dried and evaporated. The oily residue is stirred in 320 parts of cold diisopropylether. The turbid solution is filtered over activated charcoal and the filtrate is acidified with an excess of Z-propanol previously saturated with gaseous hydrogen chloride. The precipitated salt is filtered off, dried and dissolved in 100 parts of 4-methyl-2-pentanone. The solution is filtered over activated charcoal and the product is crystallized again from the filtrate upon stirring. The solid is filtered off and dried at 70-80C, yielding 1-{4-[4-hydroxy-4-(3- trifluoromethylphenyl)-piperidino]-2,2-diphenylbutyryl lpyrrolidine hydrochloride dihydrate; m.p. 1l7.5C.

EXAMPLE LV A mixture of 6.4 parts of 4-(p-chlorophenyl)-4- piperidinol, 8 parts of sodium carbonate, 0.5 parts of potassium iodide and 200 parts of 4-methyl-2- pentanone is stirred and refluxed while water is distilled off azeotropically (about 30 minutes). The mixture is cooled to about 40C and there are added 12.8 parts of l-( tetrahydro-S -methyl- 3 ,3-diphenyl-2-furylidene) pyrrolidinium bromide. The whole is stirred and refluxed overnight. Then a second portion of 10 parts of l-(tetrahydro-5-methyl-3,3-diphenyl-2-furylidene) pyrrolidinium bromide is added and stirring at reflux is continued for 12 hours. The reaction mixture is filtered hot and on cooling the filtrate to room temperature, the product is crystallized. It is filtered off and dried, yielding li4-[4-(p-chlorophenyl)-4-hydroxypiperidino]- 2,2-diphenylvaleryllpyrrolidine; m.p. 206.2C.

EXAMPLE LVl A mixture of 7.4 parts of 4-(3-trifluoromethylphenyl)-4-piperidinol, 10.6 parts of sodium carbonate, 0.5 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone is stirred and refluxed for 30 minutes with water-separator. The mixture is cooled to 40C and there are added 16.2 parts of dimethyl (tetrahydro-S-methyl-3,3-diphenyl-2-furylidene) ammonium bromide. The whole is stirred and refluxed overnight and the reaction mixture is filtered hot. The filtrate is concentrated to a volume of about 150 parts and on stirring the concentrate, the product is crystallized. It is filtered off and dried, yielding 4-hydroxy-N,N,'ytrimethyl-a,a-diphenyl-4-(3-trifluoromethylphenyl)- pipericline-l-butyramide; m.p. 169.2C.

EXAMPLE LVII A mixture of 12.1 parts of dimethyl (tetrahydro-3,3- diphenyI-Z-furylidene) ammonium bromide, 5.9 parts of 4-(p-fluorophenyl)-4-piperidinol, 8 parts of sodium carbonate, 0.5 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone is stirred and refluxed for 12 hours with water-separator. The reaction mixture is cooled and 200 parts of water is added. The organic layer is separated, washed with diluted sodium hydroxide solution, dried over magnesium sulfate, filtered over hyflo and the filtrate is evaporated. The residue is dissolved in 2-propanol and to this solution is added an excess of 2-propanol previ-' ously saturated with gaseous hydrogen chloride. The crystallized salt is filtered off and dried, yielding 4-(pfluorophenyl)-4-hydroxy-N,N-dimethyl-a,a-

' 'diphenylpiperidine-l-butyramide hydrochloride hemiisopropyl alcoholate; m.p. 233C.

' EXAMPLE LVIII A mixture of 33.5 parts of l-(tetrahydro-S-methyl- 3,3-diphenyl-2-furylidene)pyrrolidinium bromide, 5.9 parts of 4-(p-fluorophenyl)-4-piperidinol, 10.6 parts of sodium carbonate, 0.5 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone is stirred and refluxed for 3 days. The reaction mixture is filtered hot and the filtrate is allowed to cool to room temperature while stirring. The precipitatedproduct is filtered off and dried yielding l-(4-[4-(p-fluorophenyD-4- hydroxypiperidino]-2 ,2-diphenylvaleryl l-pyrrolidine', m.p. 186.3C.

EXAMPLE LIX EXAMPLE LX A mixture of 8.4 parts of 4-(4-chloro-3-trifluoromethylphenyl)4-piperidinol, 10.6 parts of sodium carbonate, 0.5 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone is stirred and refluxed for 30 minutes with water-separator. The mixture is cooled to about 40C and there are added 16.2 parts of dimethyl (tetrahydro-5-methyl-3,3-dlphenyl-2- furylidene)ammonium bromide. The whole is heated again to reflux and stirred and refluxed overnight. The reaction mixture is filtered hot and the filtrate is cooled while stirring. The crystallized product is filtered off and recrystallized from parts of 4-methyl-2- pentanone (activated charcoal), yielding 8.1 parts of the crude free base. The latter fraction, together with the combined mother-liquors, is treated'with sodium hydroxide solution and the product is crystallized again from 4-methyl-2-pentanone. The resulting product is dissolved in 4-methyl-2-pentanone and the solution is acidified with an excess of 2-propanol previously saturated with gaseous hydrogen chloride. The precipitated salt is filtered off and dried, yielding 5.5 parts of 4-(4- chloro-3-trifluoromethylphenyl)-4-hydroxy-N,N,'ytrimethyl-a,a-diphenylpiperidinel-butyramide hydrochloride; m.p. 207.5C.

EXAMPLE LXI A mixture of 6.4 parts of 4-(p-chlor'ophenyl)-4- piperidinol, 8 parts of sodium carbonate,-0.5 parts of potassium iodide and 200 parts of -4-methyl-2- pentanone is stirred and refluxed for 30 minutes with water-separator. The mixture is cooled and thre are added 13.3 parts of dipropyl (tetrahydro-3,3-diphenyl- 2-furylidene) ammonium bromide. The whole is stirred again at reflux temperature-for 4 hours. The reaction mixture is cooled and 200 pans'of water is added. The organic layer is separated, dried, treated with activated charcoahfiltered over hyflo and the filtrate is diluted with 320 parts of 4-methyl-2-pentanon The organic solution is acidified with an excess of 2-propanol previ ously saturated with gaseous hydrogen chloride. The precipitated solid salt is filtered off and dried, yielding 4-(p-chlorophenyl)-4-hydroxy-a,a-diphenyl-N,N-

dipropylpiperidine-l-butyramide hydrochloride; m.p. 255.4C.

EXAMPLE LXII A mixture of 17 parts of dibutyl (tetrahydro-3,3

diphenyl-Z-furylidene)ammonium bromide, 7 parts of 4-(p-chlorophenyl)-4-piperidinol, 9 parts of sodium carbonate, 0.5 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone is stirred and refluxed for 3 hours with water-separator. The reaction mixture is cooled and water is added. The organic layer is separated, dried, filtered and evaporated. The oily residue is dissolved in diisopropylether and gaseous hydrogen chloride is introduced into the solution. The ether is decanted and the oily salt is stirred in water, toluene,

diisopropylether and 4-methyl-2-pentanone. The solid product is filtered off and dried, yielding N,N-dibutyl- 4-(p-chlorophenyl)-4-hydroxy-a,a-diphenylpiperidinel-butyramide hydrochloride; m.p. 129.3C.

EXAMPLE LXIII B. By using equivalent amounts of the appropriate starting materials of formula (II) and formula v(lIl) in theprocedure of Example LXIlI-A, the following compounds can be prepared:

4-[4-(4-hydroxy-4-phenylpiperidino)2,2-

diphenylvaleryl]-2,6-dimethylmorpholine chloride; 4-{4-[4-hydroXy-4-(p-methylphenyl)piperidino]-2,2-

diphenylvaleryl} -2,6-dimethylmorpholine hydrochloride; and

v trifluoromethylphenyl)piperidino]-2,2-diphenylvaleryl}-2,6-dimethylmorpholine hydrochloride.

EXAMPLE LX1v A mixture of 7.6 parts of dimethyl-(tetrahydro-3,3-

diphenyl-Z-finylidene) ammonium bromide, 4.1 parts of 4-(2,4-xylyl)-4-piperidinol, 8 parts of sodium carbonate, 0.5 parts of potassium iodide and 200 parts of '4-methyl-2-pentanone is stirred and refluxed for 24' hours with water-separator." The reaction mixture is cooled and water is added. The organic layer is sepa-- rated, dried, filtered and evaporated. The residue is taken up in a mixture of acetone and diisopropylether A. A mixture of 7 parts of 4-(p-chlorophenyl)4- piperidinol, 9 parts of sodium carbonate, 0.5 parts of potassium iodide and 200 parts of 4-methyl-2- pentanone is distilled azeotropically for 30 minutes with water-separator. The mixture is cooled and 14.6 parts of 2,6-dimethyl-4-(tetrahydro-3,3-diphenyl 2- furylidene) morpholinium bromide are added. The whole is further stirred at reflux temperature for 2 hours. The reaction mixture is cooled and the layers are separated. The organic phase is dried and concentrated to about 200 parts. The residue is acidified with an excess of 2-propanol previously saturated with gaseous hydrogen chloride. Upon stirring for 30 minutes, the salt is crystallized. It is filtered off and dried overnight at 90-l00C, yielding 4-{4-[4-(p-chlorophenyl)-4- hydroxypiperidino]-2,2-diphenylbutyryl}-2,6-dimethylmorpholine hydrochloride; m.p. 240.9C.

(activated charcoal) and acidified with an excess of 2- propanol previously saturated with gaseous hydrogen chloride. The crystallized salt is filtered off and recrystallized from 4-methyl-2-pentanone, yielding 4- hydroxy-N,N-dimethyl-a,a-diphenyl-4-(2,4-xylyl)- piperidine-l-butyramide hydrochloride hydrate; m.p.

EXAMPLE LXV A. A mixture of 7 parts of 4- (p-chlorophenyl)-4- piperidinol, 9 parts of sodium carbonate, 0.5 parts of potassium iodide and 200 parts of 4-methyl-2- pentanone is distilled azeotropically to dry. After 0001- ing, there are added 14.4 parts of 4-methyl-l- (tetahydro-3,3-diphenyl-2-furylidene)-piperidinium bromide and the whole is further stirred at reflux temperature for 3 hours. The reaction mixture is cooledand water is added. The organic layer is separated, dried, filtered and evaporated to a volume of about 200 parts. The residue is acidified with an excess of 2- propanol previously saturated with gaseous hydrogen hydrochlo- EXAMPLE LXVl A mixture of 7 parts of 4-(p-chlorophenyl)-4 piperidinol, 9 parts of sodium carbonate, 0.5 parts of hydroand evaporated. The oily free base is converted into its hydrochloride salt in the conventional manner in acetone and 2-propanol. The crystallized salt is filtered off and recrystallized from boiling acetone, yielding 4-(pchlorophenyl)-N-ethyl-4-hydroxy-N-methyl-a,adiphenylpiperidine-l-butyramide hydrochloride; m.p. 215.8C.

EXAMPLE LXVII A mixture of 7 parts of 4-(p-chlorophenyl)-4- I piperidinol, 9 parts of sodium carbonate, 0.l parts of potassium iodide and 200 parts of 4-methyl-2- pentanone is distilled azeotropically to dry (waterseparator) for about 30 minutes. Then there are added 14.4 parts of 3methyl-l-(tetrahydro-3,3-diphenyl-2- furylidene) piperidinium bromide, after cooling. Upon completion, the mixture is heated to reflux and stirring at reflux temperature overnight. The reaction mixture is cooled and 200 parts of water is added. The organic layer is separated, dried and evaporated to a volume of about 200 parts. The concentrate is acidified with an excess of 2-propanol previously saturated with gaseous hydrogen chloride. The crystallized salt is filtered off and dried in vacuo, yielding l-i4-[4-(p-chlorophenyl- 4-hydroxypiperidino]-2,2-diphenylbutyryll-3- methylpiperidine .hydrochloride; m.p. 215.8C.

EXAMPLE LXVIII A. A mixture of 6.4 parts of 4-(p-chlorophenyl)-4- piperidinol, 8 parts of sodium carbonate, 0.1 parts of in diisopropylether. The solid product is filtered off,

dried, stirred once more in 4-methyl-2-pentanone and in toluene, filtered off and dried, yielding N-benzyl-4- (p-chlorophenyl)-4-hydroxy-N-methyl-a,adiphenylpiperidine- 1 -butyramide hydrochloride;

m.p. 225.4C.

B. Utilizing the procedure of Example LXVllI-A, except that equivalent quantities of the appropriate starting materials of formulas (II) and (III) are employed, the following compounds can be prepared:

N-benzyl-4-hydroxy-N y-dimethyl-4-phenyl-a,a

diphenylpiperidine- 1 -butyramide hydrochloride;

N-benzyl-4-hydroxy-N,7-dimethyl-4-(pmethylphenyl)-a,a-diphenylpiperidine-1- butyramide hydrochloride;

N-benzyl-4-hydroxy-4-(p-methoxyphenyl)-N ,'y-

dimethyLa,a-diphenylpiperidinel -butyramide hydrochloride;

N-benzyl4-( 3 ,4-dichlorophenyl )-a,a-bis( pfluorophenyl)-4-hydroxy-N-methyl-piperidinel butyramide hydrochloride;

N-benzyl-oz-(p-fluorophenyl)-4-hydroxy-4-(pmethoxyphenyl)-N-methyl-a-phenylpiperidine-1- butyramide hydrochloride; and 3 phenyl-N,y-dirnethylpiperidine-l-butyramide hydrochloride.

EXAMPLE LXlX A mixture of 9 parts of a-(zt)-4-(4-chloro-3- trifluoromethylphenyl)3-methyl-4-piperidinol hydrochloride, 10.5 parts of sodium carbonate, 0.1 parts of potassium iodide and 240 parts of 4-methyl-2- pentanone is distilled azeotropically to dry. After cooling, there are added 12 parts of dimethyl (tetrahydro- 3,3-diphenyl-2-furylidene) ammonium bromide and the whole is stirred at refluxtemperature overnight.

The reaction mixture is cooled and 200 parts of water is added. The organic layer is separated, dried, filtered and evaporated. The oily free base is converted into its hydrochloride salt in 2-propanol and 4-methyl-2- pentanone. The solid salt is filtered off and crystallized from 2-propanol, yielding after drying, a-(z'z)-4-(4- chloro-3-trifluoromethylphenyl)-4-hydroxy-N,N,3- trimethyl-a,a-diphenylpiperidine- 1 -butyramide hydrochloride; m.p. 165.6C.

EXAMPLE LXX A mixture of 9.5 parts of dimethyl (tetrahydro-3,3- diphenyl-Z-furylidene) ammonium bromide, 5.5 parts of 4-(3,4,5-trimethylphenyl)-4-piperidinol, 8.5 parts of sodium carbonate, 0.1 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone is stirred and refluxed for 24 hours with water-separator. The reaction mixture is cooled and water is added. The organic layer is separated, dried, filtered and evaporated. The oily residue is taken up in diisopropylether and acetone is added. The whole is acidified with an excess of 2- propanol previously saturated with gaseous hydrogen chloride. The crystallized salt is filtered off and recrystallized from parts of 4-methyl-2-pentanone, yielding 4-hydroxy-N,N-dimethyl-a,a-diphenyl-4-(3,4,5- trimethylphenyl) piperidine-l-butyramide I hydrochloride. 1% C H O; m.p. 157.4C.

EXAMPLE LXXI A. A mixture of 6.4 parts of 4-(p-chlorophenyl)-4- piperidinol, 8 parts of sodium carbonate, 0.1 parts of potassium iodide and 200 parts of 4-methyl-2- pentanone is distilled azeotropically to dry. Then there are added, after cooling, 13.1 parts of diallyl (tetrahydro-3,3-diphenyl-2-furylidene) ammonium bromide and the whole is stirred and refluxed for 3 hours. The reaction mixture is cooled and there is added ammonium hydroxide and water. The organic layer is separated, dried and concentrated to a volume of about 250 parts. The concentrate is acidified with an excess of 2- propanol previously saturated with gaseous hydrogen chloride while stirring. The precipitated salt is filtered off and recrystallized from 200 parts of ethanol (activated charcoal), yielding chlorophenyl)-4-hydroxy-a,a-diphenylpiperidinel butyramide hydrochloride; m.p. 258.3C.

B. Utilizing the preparative procedure of Example LXXl-A, but starting with an equivalent amount of an appropriate immonium ether precursor of formula (ll), the following compounds can be obtained:

N,N-diallyl-4-(p-chlorophenyl)-a,a-bis(pfluorophenyl )-4-hydroxypiperidine- 1 -butyramide hydrochloride; and a N,N-diallyl-4-(p-chlorophenyl)-a-(p fluorophenyl)- 4-hydroxy-oz-phenylpiperidinel -butyramide hydrochloride.

EXAMPLE LXXll A mixture of 7 parts of 4-(p-chlorophenyl)-4- piperidinol, 9 parts of sodium carbonate, 0.1 parts of potassium iodide and 200 parts of 4-.methyl-2- pentanone is stirred and distilled azeotropically to dry. The mixture is cooled and there are added 13.5 parts of methylpropyl (tetrahydro-3 ,3 -diphenyl-2- furylidene)arnmonium bromide. The whole is stirred and refluxed for 3 hours. The reaction mixture is cooled and 200 parts of water is added. The organic layer is separated, dried, filtered and concentrated to a volume of about 200 parts. The concentrate is acidified with an excess of 2-propanol previously saturated with gaseous hydrogen chloride. The precipitated salt is filtered off and dried, yielding 4-(p-chlorophenyl)-4- hydroxy-N-methyl-a,a-diphenyl-N-propylpiperidine-1- butyramide hydrochloride; m.p. 190.5C.

EXAMPLE LXXIII A mixture of 8 parts of a-(i)-4-(3- trifluoromethylphenyl)-3-methyl-4-piperidinol, 10.5 parts of sodium carbonate, 0.1 parts of potassium iodide and 240 parts of 4-methyl-2-pentanone is distilled azeotropically to dry. After cooling, there are added 13 parts of dimethyl (tetahydro- 3 ,3 -diphenyl-2- furylidene) ammonium bromide and the whole is stirred and refluxed for 3 hours. The reaction mixture is cooled and 200 parts of water is added. The organic layer is separated, dried, filtered and evaporated. The residue is dissolved in 4-methyl-2-pentanone. The solution is treated with activated charocoal, filtered and the filtrate is acidified with an excess of 2-propanol previously saturated with gaseous hydrogen chloride. The crystallized salt is filtered off, dried and recrystallized from 4-methyl-2-pentanone, yielding a-(i)-4-hydroxy- N,N,3-trimethyl-a,a-diphenyl-4-( 3- trifluoromethylphenyl)piperidinel -butyramide hydrochloride; m.p. 218.8C.

EXAMPLE LXXIV A mixture of 8.2 parts of 4-(p-chlorophenyl)-4- piperidinol, 12.7 parts of sodium carbonate, 0.1 parts of potassium iodide and 200 parts of 4-methyl-2- pentanone is distilled azeotropically to dry. After cooling, there are added 17.5 parts of methylisopropyl (tetrahydro-3,3-diphenyl-2-furylidene) ammonium bromide and the whole is stirred and refluxed for 3 hours. The reaction mixture is cooled and 200 parts of water is added. The organic layer is separated, dried, filtered and concentrated to a volume of about 250 parts. The concentrate is acidified with an excess of'2-propanol previously saturated with gaseous hydrogen chloride. The crystallized salt is filtered off and dried, yielding 4-(p-chlorophenyl)-4-hydroxy-N-isopropyl-N-methylhydrochloride;

EXAMPLE LXXV A mixture of 6 parts of a-(i)-3-methyl-4-phenyl-4- piperidinol, 10.5 parts of sodium carbonate, 0.1 parts of potassium iodide and 240 parts of 4-methyl-2- pentanone is distilled azeotropically to dry. After cooling, there are added 12 parts of dimethyl (tetrahydro- 3,3-diphenyl-2-furylidene) ammonium bromide and the whole is stirred and refluxed for 3 hours. The reaction mixture is cooled and water is added. The organic layer is separated, dried and evaporated. The oily residue is dissolved in 4-methyl-2-pentanone and the solution is acidified with gaseous hydrogen chloride. The crystallized salt is filtered off and dried, yielding (1-(i)- 4-hydroxy-N,N-3-trimethyl-a,a4-triphenylpiperidinel-butyramide hydrochloride; m.p. 226.2C.

EXAMPLE LXXVI A mixture of 6.7 parts of a-(i)-4-(p-chlorophenyl)- 3-methyl-4-piperidinol, 10.6 parts of sodium carbonate, ().5 parts of potassium iodide and 240 parts of 4-methyl-2-pentanone is distilled azeotropically to dry. After cooling, there are added 12 parts of dimethyl (tetrahydro-3,3-diphenyl-2-furylidene) ammonium bromide and the whole is stirred and refluxed overnight. Water (200 parts) is added and the organic layer is separated, dried, filtered and evaporated. The residue is dissolved in diisopropylether. The solution is filtered and the filtrate is treated with activated charcoal. The latter is filtered off and the filtrate is evaporated. The residue is dissolved in 4-methyl-2-pentanone and the solution is acidified with an excess of 2-propanol previously saturated with gaseous hydrogen chloride. The crystallized salt is filtered off, recrystallized from 4-methyl-2-pentanone and dried, yielding 12 parts of crude a-(i)-4-(p-chlorophenyl)-4-hydroxy-N,N,3- trimethyl-a,a-diphenylpiperidinel -butyramide hydrochloride. From this fraction, the free base is liberated with alkali in the conventional manner. After extraction with toluene, the latter is dried, filtered and evaporated. From the oily free base, the hydrochloride salt is again prepared by taking the oily base up in 2-propanol and then adding an excess of 2-propanol previously saturated with gaseous hydrogen chloride, yielding pure a-(i)-4-(p-chlorophenyl)-4-hydroxy-N,N,3-trimethylapt-diphenylpiperidinel -butyramide hydrochloride; m.p. 251.5C.

EXAMPLE LXXVlI A mixture of 5 .5 parts of 4-(2,5-dimethoxyphenyl)-4- piperidinol, 10.5 parts of sodium carbonate, 0.1 parts of potassium iodide and 240 parts of 4-methyl-2- pentanone is distilled azeotropically to dry. After cooling, there are added 8 parts of dimethyl (tetrahydro- 3,3-diphenyl-2-furylidene) ammonium bromide and the whole is stirred and refluxed for 2 hours. The reaction mixture is cooled and water is added. The organic layer is separated, dried, filtered and evaporated. The residue is dissolved in 4-methyl-2-pentanone and treated with activated charcoal. The latter is filtered off and the filtrate is acidified with an excess of concentrated nitric acid solution. The crystallized nitrate salt is filtered off and dried, yielding, after recrystalliation from tetrahydrofuran 4-(2,5-dimethoxyphenyl)-4- 

1. 3,3-DIARYL-TETRAHYDRO-2-FURYLIDENE AMMONIUM SALTS HAVING THE FORMULA:
 2. 1-(tetrahydro-3,3-diphenyl-2-furylidene) pyrrolidinium bromide.
 3. 1-(tetrahydro-3,3-diphenyl-2-furylidene) piperidinium bromide.
 4. 4-(tetrahydro-3,3-diphenyl-2-furylidene) morpholinium bromide.
 5. Dimethyl (tetrahydro-3,3-diphenyl-2-furylidene) ammonium bromide.
 6. Diethyl (tetrahydro-3,3-diphenyl-2-furylidene) ammonium bromide.
 7. Dimethyl (tetrahydro-5-methyl-3,3-diphenyl-2-furylidene) ammonium bromide.
 8. 1-(tetrahydro-5-methyl-3,3-diphenyl-2-furylidene) pyrrolidinium bromide.
 9. Dipropyl (tetrahydro-3,3-diphenyl-2-furylidene) ammonium bromide.
 10. Dibutyl (tetrahydro-3,3-diphenyl-2-furylidene) ammonium bromide.
 11. 2,6-dimethyl-4-(tetrahydro-3,3-diphenyl-2-furylidene) morpholinium bromide.
 12. 4-methyl-1-(tetrahydro-3,3-diphenyl-2-furylidene) piperidinium bromide.
 13. Ethylmethyl (tetrahydro-3,3-diphenyl-2-furylidene) ammonium bromide.
 14. 3-methyl-1-(tetrahydro-3,3-diphenyl-2-furylidiene) piperidinium bromide.
 15. Benzylmethyl (tetrahydro-3,3-diphenyl-2-furylidene) ammonium bromide.
 16. Diallyl (tetrahydro-3,3-diphenyl-2-furylidene) ammonium bromide.
 17. Methylpropyl (tetrahydro-3,3-diphenyl-2-furylidene) ammonium bromide.
 18. Methylisopropyl (tetrahydro-3,3-diphenyl-2-furylidene) ammonium bromide.
 19. (3,3-bis(p-fluorophenyl)tetrahydro-2-furylidene)dimethylammonium bromide.
 20. 3,3-Diphenyl-tetrahydro-2-furylidene ammonium salts having the formula: 